Heard that a lot of french women have toxo. Why is that?

Toxoplasmosis! Toxoplasmosis rarely causes disease, unless immuno-compromised. Women who have the infection in the past and contain it with antibodies, will not pass this parasite t5o the fetus. A women who aquires the infection during pregancy needs treatment to avoid transmitting it to the fetus, where it can causes significant harm. Cat litter is the most common means of getting it. French have more cats!